Hasil untuk "Trade associations"

Torben G. Andersen

E. Mendoza

Ilya A. Strebulaev

J. Lai, Xiao-Yong Jia, Da-Peng Wang et al.

There is often a trade-off between mechanical properties (modulus and toughness) and dynamic self-healing. Here we report the design and synthesis of a polymer containing thermodynamically stable whilst kinetically labile coordination complex to address this conundrum. The Zn-Hbimcp (Hbimcp = 2,6-bis((imino)methyl)-4-chlorophenol) coordination bond used in this work has a relatively large association constant (2.2 × 1011) but also undergoes fast and reversible intra- and inter-molecular ligand exchange processes. The as-prepared Zn(Hbimcp)2-PDMS polymer is highly stretchable (up to 2400% strain) with a high toughness of 29.3 MJ m−3, and can autonomously self-heal at room temperature. Control experiments showed that the optimal combination of its bond strength and bond dynamics is responsible for the material’s mechanical toughness and self-healing property. This molecular design concept points out a promising direction for the preparation of self-healing polymers with excellent mechanical properties. We further show this type of polymer can be potentially used as energy absorbing material. There is often a trade-off between mechanical properties (modulus and toughness) and dynamic self-healing in materials. Here the authors design and synthesize a polymer containing thermodynamically stable whilst kinetically labile coordination complexes to address this conundrum.

Eldrede T. Kahiya

Abstract Although research on export barriers spans five decades, no single prior study has systematically reviewed findings in this field. This study enriches the discourse on internationalization through a systematic review of the factors associated with export barriers, the theories underpinning this, and the exact nature of the relationships. Findings indicate the bulk of empirical studies focus on drivers of export barriers. The study identifies thirty-six such variables, falling in the categories of firm demographics, export venture characteristics, managerial factors, environmental and operational factors, and international trading environment. Smaller sub-streams of research investigate export barriers as predictors, mediators, and moderators. A vote counting approach dissects the associations (i.e. positive, negative, and weak) between the various factors and export barriers. Moreover, the study identifies four explicit (i.e. resource-based view, incremental internationalization, network, and institutional theories) and two implicit (i.e. attribution and rationalization) theories underlying the associations. Concerning research design and methodology, the study highlights the underrepresentation of emerging markets, longitudinal studies, cross-national comparisons, and advanced multivariate analytical tools. Finally, the study draws key implications for managers, policymakers, and educators, before setting an agenda for future research.

Benjamin Woolf, Hugo Pedder, Henry Rodriguez-Broadbent et al.

Abstract Objective To assess the cost-effectiveness of using cheaper-but-noisier outcome measures, such as a short questionnaire, for large simple clinical trials. Background To detect associations reliably, trials must avoid bias and random error. To reduce random error, we can increase the size of the trial and increase the accuracy of the outcome measurement process. However, with fixed resources, there is a trade-off between the number of participants a trial can enrol and the amount of information that can be collected on each participant during data collection. Methods To consider the effect on measurement error of using outcome scales with varying numbers of categories, we define and calculate the variance from categorisation that would be expected from using a category midpoint; define the analytic conditions under which such a measure is cost-effective; use meta-regression to estimate the impact of participant burden, defined as questionnaire length, on response rates; and develop an interactive web-app to allow researchers to explore the cost-effectiveness of using such a measure under plausible assumptions. Results An outcome scale with only a few categories greatly reduced the variance of non-measurement. For example, a scale with five categories reduced the variance of non-measurement by 96% for a uniform distribution. We show that a simple measure will be more cost-effective than a gold-standard measure if the relative increase in variance due to using it is less than the relative increase in cost from the gold standard, assuming it does not introduce bias in the measurement. We found an inverse power law relationship between participant burden and response rates such that a doubling the burden on participants reduces the response rate by around one third. Finally, we created an interactive web-app ( https://benjiwoolf.shinyapps.io/cheapbutnoisymeasures/ ) to allow exploration of when using a cheap-but-noisy measure will be more cost-effective using realistic parameters. Conclusion Cheaper-but-noisier questionnaires containing just a few questions can be a cost-effective way of maximising power. However, their use requires a judgement on the trade-off between the potential increase in risk of information bias and the reduction in the potential of selection bias due to the expected higher response rates.

Md. Akter Hossain, M.M.K. Toufique, Dilruba Yesmin Smrity et al.

This study endeavors to examine the validity of Wagner's Law, which has received considerable attention in recent years. We develop a panel dataset of 20 countries, taking five countries from each income group defined by the World Bank, for the 1991–2018 periods. Five different versions of the law are tested using this dataset. We add further depth to the model by involve the government's revenue and the volume of trade as independent variables. We inquire into the subsistence of cross-sectional dependence. To determine the order of integration, we conduct LLC, IPS, and CADF tests. The results show that the dataset has I (0) and I (1) series, and no series is found to be of I (2). Then we perform the panel ARDL test, and calculate PMG and DFE estimates. We use the Hausman test to choose among the estimates. In each version of the law, the error correction term indicates the presence of both long-term associations within the variables and an economic convergence process. However, we find no evidence to support the law for any version. Additionally, we conduct the panel cointegration tests, such as Westerlund, Pedroni and Kao. These cointegration tests generate results accordant with the ARDL findings.

Evgenia Anastasiou, Dimitrios Karkanis, Stavros Kalogiannidis et al.

This study examines the interplay between urban policy interventions, infrastructure investments, and economic and labor market outcomes in large metropolitan areas from 2017 to 2022. We have employed empirical research to unravel the phenomena among these domains by employing a comprehensive dataset comprising gross value added (GVA), compensation of employees, gross fixed capital formation, environmental taxes, trade, employment, and time series data for demographic cohort transitions. Through a linear regression analysis, we uncovered strong positive associations between gross fixed capital formation and GVA and employment per capita, highlighting the critical role of infrastructure in driving urban economic growth. We also scrutinize how population dynamics—natural population changes and net migration—affect economic performance, offering valuable insights for evidence-driven urban policy. This research informs sustainable urban economic development policies and contributes significantly to the urban economics discourse.

Rebecca D. Kehm, Jiehui Li, Erin Takemoto et al.

Abstract Background While several studies have reported the association between 9/11 exposure and cancer risk, cancer survival has not been well studied in the World Trade Center (WTC) exposed population. We examined associations of 9/11‐related exposures with mortality in WTC Health Registry enrollees diagnosed with cancer before and after 9/11/2001. Patients and Methods This is a longitudinal cohort study of 5061 enrollees with a first‐ever primary invasive cancer diagnosis between 1995 and 2015 and followed through 2016. Based on the timing of first cancer diagnosis, pre‐9/11 (n = 634) and post‐9/11 (n = 4427) cancer groups were examined separately. 9/11‐related exposures included witnessing traumatic events, injury on 9/11, and 9/11‐related post‐traumatic stress disorder (PTSD). Associations of exposures with all‐cause mortality were examined using Cox proportional hazards regression. In the post‐9/11 group, cancer‐specific mortality was evaluated by enrollee group (WTC rescue/recovery workers vs. non‐workers) using Fine and Gray's proportional sub‐distribution hazard models, adjusting for baseline covariates, tumor characteristics, and treatment. Results In the pre‐9/11 group, 9/11‐related exposures were not associated with all‐cause mortality. In the post‐9/11 group, increased risk of all‐cause mortality was associated with PTSD (adjusted HR = 1.35; 95% CI = 1.11–1.65), but not with injury or witnessing traumatic events. Cancer‐specific mortality was not statistically significantly associated with 9/11‐related exposures. In rescue/recovery workers, increased non‐cancer mortality risk was associated with PTSD (aHR = 2.13, 95% CI = 1.13–4.00) and witnessing ≥3 traumatic events (aHR = 2.00, 95% CI = 1.13–3.55). Conclusions We did not observe associations between 9/11‐related exposures and cancer‐specific mortality. Similar to findings in the non‐cancer WTC exposed population, PTSD was associated with increased risk of all‐cause mortality in cancer patients.

Marco V Alvarado, Teresa Terrazas

In tropical dry forests, studies on wood anatomical traits have concentrated mainly on variations in vessel diameter and frequency. Recent research suggests that parenchyma and fibers also play an important role in water conduction and in xylem hydraulic safety. However, these relationships are not fully understood, and wood trait variation among different functional profiles as well as their variation under different water availability scenarios have been little studied. In this work, we aim to (1) characterize a set of wood anatomical traits among six selected tree species that represent the economic spectrum of tropical dry forests, (2) assess the variation in these traits under three different rainfall regimes, and (3) determine the relationships between wood anatomical traits and possible functional trade-offs. Differences among species and sites in wood traits were explored. Linear mixed models were fitted, and model comparison was performed. Most variation occurred among species along the economic spectrum. Obligate deciduous, low wood density species were characterized by wood with wide vessels and low frequency, suggesting high water transport capacity but sensitivity to drought. Moreover, high cell fractions of carbon and water storage were also found in these tree species related to the occurrence of abundant parenchyma or septate fibers. Contrary to what most studies show, Cochlospermum vitifolium, a succulent tree species, presented the greatest variation in wood traits. Facultative deciduous, high wood density species were characterized by a sturdy vascular system that may favor resistance to cavitation and low reserve storage. Contrary to our expectations, variation among the rainfall regimes was generally low in all species and was mostly related to vessel traits, while fiber and parenchyma traits presented little variation among species. Strong functional associations between wood anatomical traits and functional trade-offs were found for the six tree species studied along the economic spectrum of tropical dry forests.

Rashad Moqa, Irfan Younas, Maryam Bashir

<h4>Background</h4> Studies on genome-wide associations help to determine the cause of many genetic diseases. Genome-wide associations typically focus on associations between single-nucleotide polymorphisms (SNPs). Genotyping every SNP in a chromosomal region for identifying genetic variation is computationally very expensive. A representative subset of SNPs, called tag SNPs, can be used to identify genetic variation. Small tag SNPs save the computation time of genotyping platform, however, there could be missing data or genotyping errors in small tag SNPs. This study aims to solve Tag SNPs selection problem using many-objective evolutionary algorithms. <h4>Methods</h4> Tag SNPs selection can be viewed as an optimization problem with some trade-offs between objectives, e.g. minimizing the number of tag SNPs and maximizing tolerance for missing data. In this study, the tag SNPs selection problem is formulated as a many-objective problem. Nondominated Sorting based Genetic Algorithm (NSGA-III), and Multi-Objective Evolutionary Algorithm based on Decomposition (MOEA/D), which are Many-Objective evolutionary algorithms, have been applied and investigated for optimal tag SNPs selection. This study also investigates different initialization methods like greedy and random initialization. optimization. <h4>Results</h4> The evaluation measures used for comparing results for different algorithms are Hypervolume, Range, SumMin, MinSum, Tolerance rate, and Average Hamming distance. Overall MOEA/D algorithm gives superior results as compared to other algorithms in most cases. NSGA-III outperforms NSGA-II and other compared algorithms on maximum tolerance rate, and SPEA2 outperforms all algorithms on average hamming distance. <h4>Conclusion</h4> Experimental results show that the performance of our proposed many-objective algorithms is much superior as compared to the results of existing methods. The outcomes show the advantages of greedy initialization over random initialization using NSGA-III, SPEA2, and MOEA/D to solve the tag SNPs selection as many-objective optimization problem.

Adamu Abubakar Muhammad

Islam condemn terrorism and rejects all its kinds, it legalized trade and investment as a way of earning halal. The activities of Boko Haram sect become a major challenge to the Nigerian government in recent times; it had led to loss of lives and properties in the country especially in Northern Nigeria.  Some of these activities include bombings, suicide, random shooting, burning of police stations, government offices and places of worship, kidnapping of school girls and innocent people, raping, armed robbery, political crises, murder, destruction of communication facilities alongside the attacks carried out by Herdsmen on some communities in the northern part of the country. Many lives and properties have been lost and a large number of citizens rendered homeless, many women are now widows, children become orphans with no hope of the future. Government had made uptight efforts to tackle these challenges posed by terrorism in the region and put an end to it but the rate of insurgency and insecurity is still disquieting. This work is therefore investigated the challenges of terrorism as a major threat on economic development in Nigeria. The scope of this study is limited on impact of terrorism on economic development in Northern Nigeria between 2000-2017. Data used was sourced from interview with related people, newspapers and related journal articles by using historical and analytical methods, the results showed that terrorism impacts negatively on economic development in Northern Nigeria, it has made government to divert resources meant for economic development purposes to security votes, expenditure made by government on security matters had positively impacted on region’s economic development. It is therefore recommended that government must be pre-emptive in dealing with security threats in view of managing security challenges. The government should accelerate the rapidity of economic growth by creating an economy with a relevant economic and physical infrastructure to support business and industrial growth, the government should remain committed and declare war on terrorism and seek assistance/advice from international communities who have in the past faced this kind of challenge and were able to tackle it, grazing grounds and ranches should be built in the region for herdsmen who rear cattle, relevant security agencies should be well train and liaised with international security experts for gaining modern tactics on fighting terrorism, religious leaders, governments, business associations and NGOs should increase their efforts on enlightment, awareness, education and sensitization campaign on the effects of terrorism on social and economic development in the region.

Jean-Noël Druon, Steven Campana, Frederic Vandeperre et al.

Blue shark (Prionace glauca) is amongst the most abundant shark species in international trade, however this highly migratory species has little effective management and the need for spatio-temporal strategies increases, possibly involving the most vulnerable stage or sex classes. We combined 265,595 blue shark observations (capture or satellite tag) with environmental data to present the first global-scale analysis of species’ habitat preferences for five size and sex classes (small juveniles, large juvenile males and females, adult males and females). We leveraged the understanding of blue shark biotic environmental associations to develop two indicators of foraging location: productivity fronts in mesotrophic areas and mesopelagic micronekton in oligotrophic environments. Temperature (at surface and mixed layer depth plus 100 m) and sea surface height anomaly were used to exclude unsuitable abiotic environments. To capture the horizontal and vertical extent of thermal habitat for the blue shark, we defined the temperature niche relative to both sea surface temperature (SST) and the temperature 100 m below the mixed layer depth (Tmld+100). We show that the lifetime foraging niche incorporates highly diverse biotic and abiotic conditions: the blue shark tends to shift from mesotrophic and temperate surface waters during juvenile stages to more oligotrophic and warm surface waters for adults. However, low productivity limits all classes of blue shark habitat in the tropical western North Atlantic, and both low productivity and warm temperatures limit habitat in most of the equatorial Indian Ocean (except for the adult males) and tropical eastern Pacific. Large females tend to have greater habitat overlap with small juveniles than large males, more defined by temperature than productivity preferences. In particular, large juvenile females tend to extend their range into higher latitudes than large males, likely due to greater tolerance to relatively cold waters. Large juvenile and adult females also seem to avoid areas with intermediate SST (~21.7-24.0°C), resulting in separation from large males mostly in the tropical and temperate latitudes in the cold and warm seasons, respectively. The habitat requirements of sensitive size- and sex-specific stages to blue shark population dynamics are essential in management to improve conservation of this near-threatened species.

Varchenko Olha.O.

The article examines the issues of intersectoral price relations in agri-food chains in Ukraine. It is proved that the imbalance of relations between different spheres of the agro-industrial complex due to price disparity causes the withdrawal of financial resources from one industry to another, without creating conditions for expanded reproduction. The factors influencing prices in agri-food chains are systematized: inflation, disparity, currency fluctuations, sales channels, etc. It is confirmed that the subjects of entrepreneurial activity of the agricultural sector of economy operated in conditions of price disparity during 2000–2019, which led to a relatively low value of their profitability. At the level of a participant in the chain of food industry entities, the price index for food industry products has been exceeded over the agricultural level, but there is a very low level of profitability – 1.4% in 2019. Analytically proved existence of a disparity between retail prices for food and agricultural products provides a profitability of wholesale and retail trade at 15.8–23.3%. Violation of the equivalence of exchange in supply chains at the level of wholesale and retail trade leads to the entry of agricultural enterprises into vertically integrated associations of the holding type. It is substantiated that ensuring the equivalence of exchange in agri-food chains requires the introduction of a set of value-added tools in the agricultural sector of antitrust regulation, market infrastructure development, rural cooperation and integration, and support for the development of small producers.

Megan E. Mikhail

Loss of control eating is a core, transdiagnostic eating disorder symptom associated with psychological distress, functional impairment, and reduced quality of life. However, the factors that contribute to persistent loss of control eating despite negative consequences are not fully understood. Understanding the mechanisms that maintain loss of control eating is crucial to advance treatments that interrupt these processes. Affect regulation models of loss of control eating hypothesize that negative emotions trigger loss of control eating, and that loss of control eating is negatively reinforced because it temporarily decreases negative affect. Several variations on this basic affect regulation model have been proposed, including theories suggesting that negative affect decreases during loss of control eating rather than afterwards (escape theory), and that loss of control eating replaces one negative emotion with another that is less aversive (trade-off theory). Experience sampling designs that measure negative affect and eating behavior multiple times per day are optimally suited to examining the nuanced predictions of these affect regulation models in people's everyday lives. This paper critically reviews experience sampling studies examining associations between negative affect and loss of control eating, and discusses the implications for different affect regulation models of loss of control eating. The review concludes by proposing an expanded affect-focused model of loss of control eating that incorporates trait-level individual differences and momentary biological and environmental variables to guide future research. Clinical implications and recommendations are discussed.

Jane Tuckerman, Nigel W Crawford, Helen S Marshall

OBJECTIVE:To determine parental awareness of influenza vaccination recommendations for children and explore associations with awareness. DESIGN:Cross-sectional survey. SETTING/PARTICIPANTS:South Australian parents with a telephone listing in the Electronic White Pages were randomly selected. METHODS:Participants were interviewed using Computer Assisted Telephone Interviewing (CATI) during May-July 2016. Univariable and multivariable analyses explored characteristics associated with awareness; with the survey data weighted to reflect the population of SA and the probability of selection within a household. RESULTS:Of 539 parents, 33% were aware of the recommendation that all children (<5 years) should receive the influenza vaccine annually with 51.9% aware that children with special risk medical conditions (SRMC) should also receive the vaccine annually. Characteristics strongly associated with parental awareness of the recommendation for children aged < 5 years were knowledge of recommendation for children with a SRMC (adjusted Odds Ratio [aOR] 10.46, CI 4.44-24.63) or living in a metropolitan area (aOR 2.91, CI 1.19-7.09). There was lack of awareness in those not working (aOR 0.13, CI 0.04-0.47), with trade level education (compared with high school) (aOR 0.25 CI, 0.09-0.71) and in those born in the UK or Ireland (aOR 0.19, CI 0.04-0.85). Awareness of the recommendation for children with SRMC to receive the vaccine was strongly associated with knowledge of the influenza recommendation for children <5 years (aOR 10.22, CI 4.39-23.77) or not being born in Australia [UK/ Ireland (aOR 7.63, CI 1.86-31.31); other (aOR 3.93, CI 0.94-16.42)]. The most influential cues to future receipt were a general practitioner (GP) recommendation (63.8%) and providing influenza vaccine free for all children (37.6%). More parents who delayed or excluded vaccines believed that their children's vaccinations (in general) were unnecessary, as other children were vaccinated (42.8%) compared to those with no or minor concerns (11.1%) (p<0.0001). CONCLUSIONS:Parental awareness of children's influenza vaccine recommendations is low. Targeted communication strategies and resources are required to establish broader community awareness of recommendations. Healthcare provider endorsement of the vaccine remains key and health care professionals, particularly GPs and paediatric specialists should be encouraged to discuss influenza vaccine with parents at every opportunity. Many parents have vaccine concerns and addressing concerns across the spectrum of hesitancy is crucial.

Wilfred J. Ethier, J. Markusen

Empirical evidence indicates a close association between multinational firms and knowledge capital, a public good within the firm. We model a firm which wishes to exploit its knowledge capital abroad, but whose workers learn all the knowledge necessary for production and can defect and produce the good themselves. The home firm must then choose between costly exporting and the possible dissipation of its knowledge capital by producing abroad. The paper examines the choice between exporting, licensing, and acquiring a subsidiary in this environment. We analyze the cost and technology parameters that support the alternative modes of serving the foreign market, and we describe the international equilibrium that jointly determines the pattern of specialization and the market mode.

Anna Piszcz

The Polish Act on Counteracting the Unfair Use of Superior Bargaining Power in the Trade in Agricultural and Food Products was adopted on 15 December 2016 and entered into force on 12 July 2017. The new legal framework resembles, in some places, the legal rules contained in the 2007 Act on Competition and Consumer Protection, elsewhere resembles the 1993 Act on Combating Unfair Competition. Therefore, the article reviews the new Polish provisions taking into account the previous system including the prohibition of the abuse of a dominant position and the prohibition of unfair competition. This publication is intended to point out the peculiarities that characterize the new provisions. Readers will find here an assessment of recent Polish developments and suggestions for further development of the Polish legal framework in the EU context. In particular, the review critically analyses some solutions of the 2018 EU draft Directive on unfair trading practices in business-to-business relationships in the food supply chain and shows what amendments to the Polish legal framework will be needed, if the Directive is adopted in the current version.

Sylvain Racaud

This paper is about the contested use of urban space, focusing on the appropriation of informal trading spaces by street traders in Kisumu, Kenya’s third largest city. The objective is to understand the access to and control of the trading streets around Jomo Kenyatta Sports Ground. These trading places are understood as a resource. I argue that legal and political contradictions create an ambiguous institutional environment. These ambiguities contribute to the development of conflicts in the use of these trading places and give advantages to actors with a key position, particularly the brokers acting as an interface between street traders and authorities. The empirical material for this study comes from surveys carried out in Kisumu between April and December 2016. 26 semi-structured interviews, three life story interviews and two focus group interviews were carried out, mainly with street traders. The first part of this paper develops the theoretical approach and the ambiguity of the street trading institutional environment. The second part deals with the daily struggle for trading places and then it focuses on projects by local authorities about street trade management. These projects increase the process of fragmentation of street traders’ associations.

M. L. Gorbunova, M. L. Gorbunov

The purpose of the study is to compare the role of the G7, the G20 and BRICS in the global governance system on the basis of an assessment of the representativeness and potential impact of these informal associations on the rest of the world on the basis of a comparative analysis of a number of socio-economic indicators of participating countries. The relevance of the research is related to the fact that these institutions represent a certain counterbalance to the leading formal universal international organizations, functioning on a permanent basis, primarily the UN. Based on a two-tier economic consolidation assessment of considered multilateral institutions participants and their respective macro-regions, the authorы came to the following conclusions: the «Group of Seven» and «Group of Twenty» have a higher potential for implementation of joint economic projects and initiatives because of a higher level of their economic consolidation based on bilateral trade; the analysis of economic connectivity of macro-regions the countries participating at global leading informal associations belong to showed a low level of effective potential for joint projects realization for most of them. It means that the multilateral institutions of highest level are capable to provide better common coordinated solutions to the problems of insiders, and not those of outsiders; the G7 members consolidate four of the five macroregions to which they belong, while among thirteen macroregions G20 members belongs to there is only one additional consolidated entity which is Southeast Asia. Thus, a threefold increase in the number of the G20 participants does not enlarge the effective geography of the G20 impact on the rest of the world; even though the BRICS group has the reduced potential for effective implementation of joint participant initiatives because of low level of consolidation union members lesser than 10%, and only China belongs to the economically connected macro-region - East Asia; Brazil, Russia and South Africa are included in the potentially prospective regions with a level of connectivity more than 15%.